Concrete-mixing machine.



O. BUCHANAN & M. JARVIS. CONCRETE MIXING MAGHINE. APPLICATION FILED NQV.4,1910.

1,001,?29 7 v Patented Augr29, i911.

"E lfillnu os az M 65' G. BUOHANAN & M. JARVIS. CONCRETE MIXING MACHINE,APPLICATION FILED NOV. 4, 1910.

1,001,729. Patent ed Aug. 29,1911.

3 SHEETS-SHEET 2.

i 3 afiachana'wb.

G. BUUHANAN 6; M. JARVIS.

) CONCRETE MIXING MACHINE. APPLICATION FILED NOV. 4, 1910.

Pater lted Aug. 29, 1911.

3 SHEETSSHEET 3.

a .75 @319? I w Ziwuwwtoz @LE Q 6% anan, W K mzdfififi arbia mow,

uring feed scoops or boxes are identical in construction, and We willtherefore only describe one ofthem.

Each feed scoop or box comprises a curved outer wall L2 which isconcentric with the mixing cylinder, and side walls 43 provided withoutstanding flanges tat,

which are secured by screws or bolts 45 to the cylinder. The front endaccording to the direction of the rotation of the mixing cylinderindicated by the arrow in Fig. 3, of each feed scoop or box is open, andits rear end is also open. In the rear portion of each feed scoop or boxis a gage element- 46, forming a movable closure therefor, and providedwith a curved arm 4:7 which bears on the outer side of the mixingcylinder and is provided with a longitudinal slot as engaged by a bolt49 which secures the said arm and hence the said gage element to themixing cylinder and enables the gage element to be adjusted so as-tovary the capacity of the measuring feed scoop or box in which the saidgage element is disposed. Hence the effective cubic capacity of the feedscoop orbox may be regulated at will, by appropriately adjusting thegage element thereof, so that each feed scoop or box may be, at eachrevolution of the mixing cylinder, caused to deliver a certainpredetermined quantity of material thereto It will be observed that asthe mixing cylinder rotates in the direction indicated by the, arrow,each feed scoop or box as it moves through one of the compartments,inthe hopper Will become filled with material.

For each feed opening of the mixing cylinder, we provide anautomatically act: ing closure element such as indicated at 511 The saidclosure elements are segmental in form and curved on an arccorresponding with the inner surface of the mixing cylinder, and thesaid closure elements are suf- ,ficiently' large to entirely cover thefeed openings in the mixing cylinder when the said closure elements bearagainst the inner surface of said cylinder. Each closure ele ment has abent arm 54 attached thereto asat 55, the opposite end of the said bentarm beingz'pivotally mounted as at 56 between a pair of lugs 57 of aplate 58, the said plate being bolted to the inner side of the mixingcylinder as at 59, at a suitable point and being provided at one endwith a stop- (30 to limit the movement of the said bent arm in onedirection. I

. 'It will be observed by. reference to Fig. 3

elements by their own gravity as the pivoted ends of their arms noveupwardly, by the rotation of the mixing cylinder close against the innerside of the mixing cylinder, and cover the feed openings so that whilethe feed scoops or boxes become filled with the material, asthey movethrough the mass of the same, in the hopper, the material remains in'the said feed scoops or boxes until thesame is movedv upwardly out ofthe hopper at which time the pivoted ends of the arms 54 of the closureelements are uppermost and hence said closure elements by their owngravity swing inwardly 1n the mixing cylinder, uncover the feed openingsthereof, and permit the material to drop from the feed scoops or boxesinto the mixing cylinder.

In the side of the mixing cylinder opposite the feed openings is aseries of obliquely disposed blades 60 which act to urge the materialrearwardly in the mixing cylinder as the latter rotates, and cause thematerial fed to the cylinder by the feed scoop or boxes, andmixed by thereturning of the cylinder, to be discharged from the open, rear end ofthe said cylinder, as will be understood.

A tank or reservoir 61 is secured on the upper portion ofthe yoke bar 8and is proyided with a pipe 62 which leads into. the

rear end of the cylinder and is provided with perforations which spraywater on the material mixed in the cylinder. This pipe is provi edwith'a suitable regulating valve 63 by means of which the quantity ofwater supplied 'to the mixed material may be regulated as may becomenecessary. Since each feed box or scoop becomes tilled with material ateach revolution of the mixas provided at opposite sides of the machinew'ith screens 6% for screening the sand as it is thrown into the saidcompartment. iVe' also showa 'pivotally mounted hood 65 at the reardischarge end ofthe mixing cylinder. This hood when lowered collects thematerial discharged from the mixing cylinder and when raised dumps thesame.

While we have herein shown and described What'we now "regard as thepreferred embodiment of our invention, we. would havefit understood thatchanges may be made in the form proportion, and construction of theparts, and'that modifications may be made Within the scope of ourinvention asdefined by the appended claims.

'WGCifliHli-r j I 1. In a machine of the class described, in

combination with a hopper, a revoluble mixing cylinder having a feedscoop or box on the outer side thereof, and communicating therewith, thesaid feed scoo orbox being open at its front and rear si es, and a gageelement to form a closure for the rear side of the feed scoop or box,movable in said feed scoop or box, and provided on its rear side With acurved armbearing on'the outer side of the mixing cylinder, and meansseing with said mixing element, and an auto.-.

Witnesses: ing element for cutting off communication between said feedscoop or box and said niatically acting closure carried by the mixmixinelement at one period of the rota tion 0 the latter.

3. In 'a machine of the class described, a

- revoluble mixing element having a feed scoop or box on 1ts outer slde,and automat1-- cally acting means carried by the mixing element forcutting off communication between said feed scoop or box and said mixingelement at one period of the rotation of the latter.

4. In a machine of the class described, a revoluble mixing elementhaving a feed opening, a feed scoop or box on said mix-- ing element,and communicating therewith through said ,feed opening, and a pivotallymounted closure element in the mixing eleme'nt acting vby gravity toclose said feed opening during one period of the rotation of said mixingelement.

In testimony whereof We hereunto aflix our. signatures in the presenceof two Witnesses.

CHARLES BUCHANAN. MARION JARVIS.

CHANCE E. DEWALD, OLIVE MCCARTHY.

